Sintering tray



FIG. 1 is a perspective view showing the new design for a sintering tray;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a front side view thereof.

The broken lines are included for the purpose of illustrating the environment only and form no part of the claimed design. 

The ornamental design for a sintering tray, as shown and described. 